It's been no surprise NFL teams needing a new coach already are in hot pursuit, but now the interest may be mutual.

O'Brien led the Nittany Lions to an 8-4 record in his first season with the program, taking over in difficult circumstances succeeding the late Joe Paterno in the wake of the Jerry Sandusky scandal. He was hired after a brilliant 2011 season as offensive coordinator for the New England Patriots.

According to Jason LaCanfora of CBS Sports, four teams will pursue O'Brien. They include the Philadelphia Eagles, Cleveland Browns, San Diego Chargers and Arizona Cardinals.